NOTE - Please feel free to correct the title if it is not describing correctly what I am asking here.

What I want to know is, how can I know via Nautilus or a GUI app, the filesystem direction of a pen drive or external usb drive. For example, when I connect a external hard drive called "Mary". In Nautilus or looking at the properties of the device in Nautilus it mentions that is was mounted in /media/mary but I want to know if it is /dev/sdb1, /dev/sdc1, etc...

Might be me missing the coffee but I just forgot about doing a "dmesg | tail -n3" after mounting the unit. Thank Rinzwind. But anyway if you have some sort of plugin for Nautilus to also show that info while checking out the properties of the device it would help a little bit more. Also thanks for the ls examples, did not know those.
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Luis Alvarado♦Mar 9 '12 at 15:36